Yes a variety of advice is confusing but it is by no means restricted to the UK, Baz...
This might help a little to explain.
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On UK govt website it states
https://www.gov.uk/guidance/travel-advice-novel-coronavirus#when-you-return-to-the-uk-protect-yourself-and-others
When you return to the UK: protect yourself and others
The National Travel Health Network and Centre (NaTHNaC) provides advice on how to stay safe as you travel by air.
When you return to the UK on a flight from another country, you should follow the government advice that applies to everyone:
- go straight home from the airport, avoiding public transport where possible. Only people living in your household, for example a family member, should collect you from the airport. If you need to travel on to Scotland, see the Traveline Scotland guidance
- stay at home and only go outside for food, health reasons, daily exercise or work if you absolutely cannot work from home
- if you go out: always stay 2 metres (6 feet) away from other people, do not touch your face, and wash your hands frequently, including as soon as you get home
If you start to have symptoms like a high temperature or frequent cough, go straight home and self-isolate for 7 days. See the guidance for households with a possible infection and call NHS 111 if your symptoms worsen.
For further guidance, visit gov.uk/coronavirus or visit nhs.uk for specialist medical advice.
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As for face masks
https://inews.co.uk/news/uk-face-mask-advice-coronavirus-government-public-covid-19-recommendation-explained-2546640
“What do health officials say?
Public Health England currently says face masks "play a very important role" in hospitals "but there's very little evidence of widespread benefit from their use outside of these clinical settings".
According to the World Health Organization (WHO), masks only need to be worn by the general public if an individual is sick, or if a person is caring for someone suspected to have the virus.”
......”There is currently no evidence that wearing a mask (whether medical or other types) by healthy persons in the wider community setting, including universal community masking, can prevent them from infection with respiratory viruses."
It warned that they could create a "false sense of security" and lead to people ignoring other protective measures, such as hand washing and distancing. The WHO added that medical masks needed to be reserved for health workers.”
......”The European Centre for Disease Prevention and Control acknowledges that face masks in the public could help "reduce the spread of the infection in the community by minimising the excretion of respiratory droplets from infected individuals who have not yet developed symptoms or who remain asymptomatic" and could be considered in busy, closed spaces.
It adds: "It is not known how much the use of masks in the community can contribute to a decrease in transmission in addition to the other countermeasures."
Again, the centre says medical masks should be prioritised for health workers and that non-medical versions (such as those made of textiles) could be considered for the public.”
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......”However, a researchers has said that homemade masks for the public could "wipe out" the virus.
"If 80 to 90 per cent of us do it, and if the masks were say 80-90 per cent effective, that would probably - the modellers say - be enough to reduce the effective R0 [the average number of people who will catch Covid-19 from an infected person] down to wipe out this disease and we can all get on with our lives," said Trish Greenhalgh, professor of primary health care at the University of Oxford, in a web briefing for the Royal Society of Medicine on Tuesday.
And more than 100 UK medics have backed the international Masks4All campaign.
Its website says: "The WHO only recommends masks for those infected with Covid-19 or those taking care of people infected with Covid-19. But ~50% of people who have Covid-19 are asymptomatic. So it follows basic logic that if we don't know who has it and anyone who has it needs to wear a mask, then we should all wear masks."
But others suggest more information about Covid-19 is needed before we know how effective masks are in tackling the virus.
"One justification for wearing any kind of mask is that they must inevitably reduce viral load and that being exposed to lower levels of virus must reduce serious clinical symptoms," says William Keevil, professor of environmental healthcare at the University of Southampton. "But Covid-19 appears easily transmissible and we know little about the virus infectious dose and how it is administered."
If the Government changes its policy on masks, there needs to be an "immediate education programme" so the public knows how to wear them properly, he adds.”
So as you can see this debate and ongoing medical advice is still being analysed and goes far wider than just the UK.
At the end of the day and in the interim we have to make our own judgements based on all the above.